From 831ec0b4226cec7ea34f5c4c9810e78aeb2069bf Mon Sep 17 00:00:00 2001 From: Carolyn Wyborny Date: Fri, 11 Mar 2011 20:43:54 -0800 Subject: igb: Add DMA Coalescing feature to driver This patch add DMA Coalescing which is a power-saving feature that coalesces DMA writes in order to stay in a low-power state as much as possible. Feature is disabled by default. Signed-off-by: Carolyn Wyborny Tested-by: Jeff Pieper Signed-off-by: Jeff Kirsher --- drivers/net/igb/e1000_defines.h | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) (limited to 'drivers/net/igb/e1000_defines.h') diff --git a/drivers/net/igb/e1000_defines.h b/drivers/net/igb/e1000_defines.h index 97969ad8afe..9bb19282589 100644 --- a/drivers/net/igb/e1000_defines.h +++ b/drivers/net/igb/e1000_defines.h @@ -287,7 +287,34 @@ #define E1000_TCTL_COLD 0x003ff000 /* collision distance */ #define E1000_TCTL_RTLC 0x01000000 /* Re-transmit on late collision */ -/* Transmit Arbitration Count */ +/* DMA Coalescing register fields */ +#define E1000_DMACR_DMACWT_MASK 0x00003FFF /* DMA Coalescing + * Watchdog Timer */ +#define E1000_DMACR_DMACTHR_MASK 0x00FF0000 /* DMA Coalescing Receive + * Threshold */ +#define E1000_DMACR_DMACTHR_SHIFT 16 +#define E1000_DMACR_DMAC_LX_MASK 0x30000000 /* Lx when no PCIe + * transactions */ +#define E1000_DMACR_DMAC_LX_SHIFT 28 +#define E1000_DMACR_DMAC_EN 0x80000000 /* Enable DMA Coalescing */ + +#define E1000_DMCTXTH_DMCTTHR_MASK 0x00000FFF /* DMA Coalescing Transmit + * Threshold */ + +#define E1000_DMCTLX_TTLX_MASK 0x00000FFF /* Time to LX request */ + +#define E1000_DMCRTRH_UTRESH_MASK 0x0007FFFF /* Receive Traffic Rate + * Threshold */ +#define E1000_DMCRTRH_LRPRCW 0x80000000 /* Rcv packet rate in + * current window */ + +#define E1000_DMCCNT_CCOUNT_MASK 0x01FFFFFF /* DMA Coal Rcv Traffic + * Current Cnt */ + +#define E1000_FCRTC_RTH_COAL_MASK 0x0003FFF0 /* Flow ctrl Rcv Threshold + * High val */ +#define E1000_FCRTC_RTH_COAL_SHIFT 4 +#define E1000_PCIEMISC_LX_DECISION 0x00000080 /* Lx power decision */ /* SerDes Control */ #define E1000_SCTL_DISABLE_SERDES_LOOPBACK 0x0400 -- cgit v1.2.3-18-g5258